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US 6,640,107 B1Granted
Wireless location handset apparatus
AssigneeHitachi, Ltd.
InventorsMikio Kuwahara, Katsuhiko Tsunehara
Life of this patent
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AssigneeHitachi, Ltd.
InventorsMikio Kuwahara, Katsuhiko Tsunehara
Estimating the term…
A periodical signal is transmitted from a cellular base station. A memory circuit having a capacity of the signal for one cycle is provided. Newly received information is added to information previously accumulated in the memory circuit, and the resultant information is again accumulated in the memory circuit, thereby enabling the received information to be stored in the memory circuit having the capacity for only one cycle of the signal. Conventionally, a large amount of memory has been required to perform coherent adding for a long time period, whereas the present invention can reduce the circuit scale and the amount of memory, and also reduce the number of times of operations required for the long-period coherent adding, when a mobile station is located using a cellular communication system.
A wireless location handset apparatus for estimating a position of a mobile station using signals coming from at least first and second base stations in a cellular communication system, wherein an amount of phase rotation for signals received from said base stations is estimated based on a signal received from said first base station of which a reception quality is higher than that of a signal received from said second base station, said wireless location handset apparatus comprising:
Dependencies are inferred from the claim text.